Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “guinea pig”

See all translations

guinea pig

noun [C]  /ˈɡɪn·i ˌpɪɡ/ us  
a small, furry animal with rounded ears, short legs, and no tail, often kept as a pet and for use in scientific experiments fig. A guinea pig is also a person used in a test, esp. one to discover how effective a new drug or process is: Her own son accused her of having used him as a guinea pig to test her theories about the education of children.
(Definition of guinea pig from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of guinea pig?
Add Cambridge dictionaries to your browser to your website

Definitions of “guinea pig” in other dictionaries

Word of the Day

derivative

If something is derivative, it is not the result of new ideas, but has been developed from or copies something else.

Word of the Day

Lies, lies, lies!

by Kate Woodford,
February 25, 2015
​​​ According to sociologists (=people who study the relationships between people living in groups), we are good at lying. As a species, we have developed a remarkable ability to deceive each other (= persuade each other that something false is true). Being able to say things that are not true can help with

Read More 

snapchat verb

March 02, 2015
to send someone a message using the photomessaging application Snapchat We used to have a thing until he got a girlfriend. now

Read More